80865643 has 2 divisors, whose sum is σ = 80865644. Its totient is φ = 80865642.

The previous prime is 80865641. The next prime is 80865647. The reversal of 80865643 is 34656808.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80865643 - 2¹ = 80865641 is a prime.

Together with 80865641, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 80865596 and 80865605.

It is not a weakly prime, because it can be changed into another prime (80865641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40432821 + 40432822.

It is an arithmetic number, because the mean of its divisors is an integer number (40432822).

Almost surely, 2^80865643 is an apocalyptic number.

80865643 is a deficient number, since it is larger than the sum of its proper divisors (1).

80865643 is an equidigital number, since it uses as much as digits as its factorization.

80865643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 80865643 is about 8992.5326243501. The cubic root of 80865643 is about 432.4355086661.

The spelling of 80865643 in words is "eighty million, eight hundred sixty-five thousand, six hundred forty-three".